HP LaserJet 1100 Printer series - Changes to PCL 5 Color Commands

Changes to PCL 5 Color Commands

The focus of the printer’s color support is on WYSIWYG color usage and a simplified usage model. A number of PCL 5 color commands introduced in the HP Color LaserJet and supported in the Color LaserJet 5 printer have been made obsolete as a direct result of using Standard RGB color to achieve WYSIWYG color. Furthermore, several commands have been modified to match the predicted use of the HP Color LaserJet 4500 printer.

of precision were added to avoid rounding errors when converting to pixels.

• Picture Frame Scaling Command — four decimal places of

precision were added to avoid rounding errors.

• Configure Image Data — This command had two major

forms, the short form which selected default values for each of the color spaces specified, and the long form which allowed a complete specification of the parameters that characterize the color spaces. The long form of the command is not supported on this printer since the Luminance-Chrominance, CIE L*a*b*, and Colorimetric RGB (cRGB) color spaces are not supported. The supported color spaces are Standard RGB (sRGB), Device RGB, and Device CMY. The sRGB color space is selected using the same value as cRGB to enable files printed with the Color LaserJet and Color LaserJet 5 drivers to take advantage of the Color LaserJet 4500's use of sRGB for WYSIWYG color. Furthermore, the specification of white and black points for the Device RGB and CMY color spaces, and the HP-GL/2 Color Range command, is not supported.

2-116 Printer-Specific Differences

ENWW

• Render Algorithms — There are no new algorithms for this

command that had twenty different algorithms, of which almost half of them were monochrome equivalents of color algorithms. The following table lists the algorithms that are supported:

The monochrome algorithms are no longer supported since there are no applications which allow the user to specify that a color image should sometimes be printed in color and other times in black and white. The remainder of the algorithms are not supported as they are not needed for quality WYSIWYG color printing.

• Download Dither Matrix — Not supported

• Color Lookup Tables — Not supported since it does not

support WYSIWYG color.

• Gamma Correction — Not supported since it does not

support WYSIWYG color.

• Viewing Illuminant — Not supported since it does not support

WYSIWYG color.

• Monochrome Print Mode — This command is only supported

at the beginning of a job, since user applications only support the choice of monochrome printing of color documents for an entire document.